SNPs rs10759243 in the KLF4 gene (OR = 1.333, 95% CI, 1.090 – 1.629, p = 0.005), rs704010 in the ZMIZ1 gene (OR = 1.304, 95% CI, 1.053 – 1.614, p = 0.015) are associated with an increased the ER+ BC risk (Supplementary Table S2). Here, KLF4 is linked to breast cancer.